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Rapid industrialization in Asia in the last two decades has resulted in asignificant increase in Asian ozone (O3) precursor emissions withlikely a corresponding increase in the export of O3 and itsprecursors. However, the relationship between this increasing O3, thechemical environment, O3 production efficiency, and the partitioningbetween anthropogenic and natural precursors is unclear. In this work, weuse satellite measurements of O3, CO and NO2 from TES(Tropospheric Emission Spectrometer), MOPITT (Measurement of Pollution InThe Troposphere) and OMI (Ozone Monitoring Instrument) to quantify O3 precursoremissions for 2006 and their impact on free tropospheric O3 overnortheastern Asia, where pollution is typically exported globally due tostrong westerlies. Using the GEOS-Chem (Goddard Earth Observing System Chemistry) global chemical transport model, wetest the modeled seasonal and interannual variation of O3 based onprior and updated O3 precursor emissions where the updated emissionsof CO and NOx are based on satellite measurements of CO and NO2.We show that the observed TES O3 variability and amount are consistentwith the model for these updated emissions. However, there is littledifference in the modeled ozone between the updated and prior emissions. Forexample, for the 2006 June time period, the prior and posterior NOxemissions were 14% different over China but the modeled ozone in thefree troposphere was only 2.5% different. Using the adjoint of GEOS-Chemwe partition the relative contributions of natural and anthropogenic sourcesto free troposphere O3 in this region. We find that the influence oflightning NOx in the summer is comparable to the contribution fromsurface emissions but smaller for other seasons. China is the primarycontributor of anthropogenic CO, emissions and their export during thesummer. While the posterior CO emissions improved the comparison betweenmodel and TES by 32%, on average, this change also had only a smalleffect on the free tropospheric ozone. Our results show that the influenceof India and southeastern Asia emissions on O3 pollution export to thenorthwestern Pacific is sizeable, comparable with Chinese emissions in winter,about 50% of Chinese emissions in spring and fall, and approximately20% of the emissions in the summer

Constraints on Asian ozone using Aura TES, OMI and Terra MOPITT